A New Type Of Nozzle Developed for the Study of the Effect of Shot-size on Intensity of Peening Under Specified Peening Param

Author:  Sharma, M.C. and Jain, A.K.
Source:  Conf Proc: ICSP-1, (p.175-184)
Doc ID:  1981000
Year of Publication:  1981
A new type of nozzle was developed for a shot-peening equipment designed and fabricated for laboratory use. For given peening parameters the overpeening (saturation) effect using nozzles of different dia. with steel shot of different sizes on medium-carbon steel strips of different thickness were determined. The equipment could also be used for shot peening condenser tubes to enhance their heat transfer coefficient under nuclear pool boiling. A nozzle with 7.0 mm throat dia. under similar peening conditions gave overpeening effect after 15, 60 and 90 s for medium-C steel strips of thickness 1.0, 1.5 and 2.0 mm, respectively. It was also observed that the thicker the strip the lesser was the arc height under similar peening conditions. Of shot types S-170, S-280, S-330 and S-390 under similar conditions of peening, S-390 was more effective. The nozzle with 5.0 mm throat dia. could give overpeening for 1.5 mm thick strip with only one type of shot, i.e. S-330 after 90 s. Descriptors: Carbon steels-- Surface finishing; Shot peening; Nozzles; Particle size

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